chromium thirt_party skia编译shared_liberary

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默认情况下，Android4.4 chromium webview使用的skia是系统的skia

  'conditions': [    # In component mode (shared_lib), we build all of skia as a single DLL.    # However, in the static mode, we need to build skia as multiple targets    # in order to support the use case where a platform (e.g. Android) may    # already have a copy of skia as a system library.    ['component=="static_library" and use_system_skia==0', {      'targets': [        {          'target_name': 'skia_library',          'type': 'static_library',          'includes': [            'skia_library.gypi',            'skia_common.gypi',          ],        },      ],    }],    ['component=="static_library" and use_system_skia==1', {      'targets': [        {          'target_name': 'skia_library',          'type': 'none',          'includes': ['skia_system.gypi'],        },      ],    }],    ['component=="static_library"', {      'targets': [        {          'target_name': 'skia',          'type': 'none',          'dependencies': [            'skia_library',            'skia_chrome',          ],          'export_dependent_settings': [            'skia_library',            'skia_chrome',          ],        },        {          'target_name': 'skia_chrome',          'type': 'static_library',          'includes': [            'skia_chrome.gypi',            'skia_common.gypi',          ],        },      ],    },    {  # component != static_library      'targets': [        {          'target_name': 'skia',          'type': 'shared_library',          'includes': [            'skia_library.gypi',            'skia_chrome.gypi',            'skia_common.gypi',          ],          'defines': [            'SKIA_DLL',            'GR_DLL=1',            'GR_IMPLEMENTATION=1',            'SKIA_IMPLEMENTATION=1',          ],          'direct_dependent_settings': {            'defines': [              'SKIA_DLL',              'GR_DLL=1',            ],          },        },        {          'target_name': 'skia_library',          'type': 'none',        },        {          'target_name': 'skia_chrome',          'type': 'none',        },      ],    }],  ],

变量

use_system_skia

控制是否采用系统所带的skia，但如果因为升级或者移植，skia可能版本不一样，因此不如用chromium中自带的skia.

修改build/common.gypi中代码：

        'use_system_skia%': '<(android_webview_build)',

编译webview的话，默认使用系统的skia, 只要注释它则会用thirt_party的skia.

另一个参数是component，也在build/common.gypi

'component%': 'static_library',

修改为shared_library则可。修改后，gyp之后，编译可能出现问题：

warning: shared library text segment is not shareableerror: treating warnings as errors

参考

1）http://gcc.gnu.org/onlinedocs/gcc-4.8.1/gcc/Code-Gen-Options.html#Code-Gen-Options2）http://eli.thegreenplace.net/2011/11/03/position-independent-code-pic-in-shared-libraries/

--warn-shared-textrel Warn if text segment is not shareable
--no-warn-shared-textrel Do not warn if text segment is not shareable (default)

gyp生成mk文件时，在DEBUG和Rlease中都加入了warn-shared-textrel选项。

去掉则可。

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